<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length>0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">

          <!-- 选中的样式是在后面,添加一个active,背景颜色为灰色 -->
          <div class="tr" :class="{active:item.isChecked}" v-for="item in fruitList" :key="item.id">
            <!-- 单选框选中效果 -->
            <div class="td" :style="{checked:item.isChecked}"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <!-- 也可以隐藏,只有1的时候隐藏 -->
                <button class="decrease" @click="sub(item.id)" :disabled="item.num<=1"> - </button>
                <span class="my-input__i">{{item.num}}</span>
                <button class="increase" @click="add(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{item.price * item.num}}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>
          <!-- 
          <div class="tr">
            <div class="td"><input type="checkbox" /></div>
            <div class="td"><img src="http://autumnfish.cn/static/荔枝.png" alt="" /></div>
            <div class="td">7</div>
            <div class="td">
              <div class="my-input-number">
                <button disabled class="decrease"> - </button>
                <span class="my-input__inner">1</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">14</div>
            <div class="td"><button>删除</button></div>
          </div> -->
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all" :style="{checked:isCheckAll}">
          <input type="checkbox" v-model="isCheckAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{getTotalPrice}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{getCount}} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        defaultList: [
          {
            id: 1,
            icon: 'http://autumnfish.cn/static/火龙果.png',
            isChecked: true,
            num: 2,
            price: 6,
          },
          {
            id: 2,
            icon: 'http://autumnfish.cn/static/荔枝.png',
            isChecked: false,
            num: 7,
            price: 20,
          },
          {
            id: 3,
            icon: 'http://autumnfish.cn/static/榴莲.png',
            isChecked: false,
            num: 3,
            price: 40,
          },
          {
            id: 4,
            icon: 'http://autumnfish.cn/static/鸭梨.png',
            isChecked: true,
            num: 10,
            price: 3,
          },
          {
            id: 5,
            icon: 'http://autumnfish.cn/static/樱桃.png',
            isChecked: false,
            num: 20,
            price: 34,
          },
        ],
        // 水果列表
        fruitList: localStorage.getItem('fruitList') ? JSON.parse(localStorage.getItem('fruitList')) : defaultList,
      },
      methods: {
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        },
        // 减和加
        sub(id) {
          // 根据id 找到对应的数据项,修改num的值
          const fruit = this.fruitList.find(item => item.id === id)
          console.log('-', fruit);
          // if (fruit.num === 1) {
          //   // 执行删除的命令
          //   this.del(id)
          // }
          fruit.num--
        },
        add(id) {
          // 根据id 找到对应的数据项,修改num的值
          const fruit = this.fruitList.find(item => item.id === id)
          console.log('+', fruit);
          fruit.num++
        },
      },
      computed: {
        isCheckAll: {
          get() {
            // 每一项都选中,才会选中
            return this.fruitList.every(item => item.isChecked === true)
          },
          set(newValue) {
            // if (newValue) {
            //   this.fruitList.forEach(item => {
            //     item.isChecked = true
            //   })
            // } else {
            //   this.fruitList.forEach(item => {
            //     item.isChecked = false
            //   })
            // }
            this.fruitList.forEach(item => {
              item.isChecked = newValue
            }
            )

          }

        },
        // 统计总数
        getCount() {
          return this.fruitList.reduce((sum, item) => {
            if (item.isChecked) {
              sum += item.num
            }
            return sum
          }, 0)

        },
        getTotalPrice() {
          return this.fruitList.reduce((sum, item) => {
            if (item.isChecked) {
              sum += item.num * item.price
            }
            return sum
          }, 0)
        }


      },
      // 监听对象中的每个属性的变化,如果变化,就存储到本地
      watch: {
        fruitList: {
          deep: true,
          handler(newValue) {
            console.log(newValue);
            localStorage.setItem('fruitList', JSON.stringify(newValue))

          }
        }
      }
    })
  </script>
</body>

</html>